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Mongrel Mob gang member Christopher Manuel was married earlier in the day and has admitted chasing, beating and killing Mr Rata.

In his opening address to a jury of six women and six men, Crown solicitor Mike Smith said Gregory Mark Comer told police a person investigators wanted to speak to had left Kaitaia with him before Rata was attacked. That turned out to be a lie, he said.

Manuel's wedding attire consisted of a red Mongrel Mob vest over a T-shirt, a pair of red shorts and a black bum bag. He also wore a Nazi-style helmet. It's believed the helmet was used to bash Rata.

Smith said the Comers interfered with a major police investigation as both arranged for the removal of the helmet from a house and other items of interest to detectives.

Police obtained orders from the High Court, Smith told the jury, to listen to phone conversations between the father and son.

In one of the phone conversations, he said Gregory Matthew Comer was heard telling his father: "It's sorted, I've melted it down, stay off the phone" or words to that effect.

Smith said although they did not speak in coded terms, their language was guarded as they were well aware of the police investigation.

Earlier, Justice Paul Davison told the jury to reach their verdicts solely on evidence before the court and not to discuss the case with anyone who was not on the jury.